Mol is the first 3 letters in one of my moms dogs name (Molly), Luc is the first 3 letters in my moms cats name (Lucy, who used to be my cat) and Cass is the first 4 letters of the name of a rescued chow/akita mix puppy I found (Cassie). I found a home for her, but I like this name, so now I use it everywhere. When I created the username, that was the only 3 pets we had.

Normally it looks like this: MoLuCass


If a forum won't let me use this name because it has "ass" in it, or something like that, I use AngelCori.